An Improved Droop Control Strategy of Microgrid

With the energy crisis and environmental problem getting worse, the distributed power generation (DG) is undergoing a significant development all around the world. For this reason, the prototype of microgrid has been proposed. As a basic power electronic interface unit in microgrid, the reasonable and effective control of the microgrid inverter determines directly the safe and stable operation of the microgrid. To address the drawback of an inherent trade-off between power sharing and voltage and frequency regulation of the traditional droop control methods. An improved adaptive droop method is investigated for the control of the inverters. In the proposed method, a linear function of the power and droop coefficient is introduced to realize the adaptive regulation for the droop coefficients with the power variation, while a power derivative term is introduced to instantaneously reflect the trend of power, which effectively improving the stable operation performance and dynamic response capability. Finally, experimental results are used to validate the proposed droop control method.